| Martin Bogomolni | 9680b3d | 2011-06-13 16:50:33 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2011 Calxeda, Inc. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms and conditions of the GNU General Public License, |
| 6 | * version 2, as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along with |
| 14 | * this program. If not, see <http://www.gnu.org/licenses/>. |
| 15 | */ |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/errno.h> |
| 18 | #include <linux/smp.h> |
| 19 | |
| 20 | #include <asm/smp_scu.h> |
| 21 | #include <asm/cacheflush.h> |
| 22 | |
| 23 | #include "core.h" |
| 24 | |
| 25 | extern void secondary_startup(void); |
| 26 | |
| 27 | int platform_cpu_kill(unsigned int cpu) |
| 28 | { |
| 29 | return 1; |
| 30 | } |
| 31 | |
| 32 | /* |
| 33 | * platform-specific code to shutdown a CPU |
| 34 | * |
| 35 | */ |
| 36 | void platform_cpu_die(unsigned int cpu) |
| 37 | { |
| 38 | flush_cache_all(); |
| 39 | |
| 40 | highbank_set_cpu_jump(cpu, secondary_startup); |
| 41 | scu_power_mode(scu_base_addr, SCU_PM_POWEROFF); |
| 42 | |
| 43 | cpu_do_idle(); |
| 44 | |
| 45 | /* We should never return from idle */ |
| 46 | panic("highbank: cpu %d unexpectedly exit from shutdown\n", cpu); |
| 47 | } |
| 48 | |
| 49 | int platform_cpu_disable(unsigned int cpu) |
| 50 | { |
| 51 | /* |
| 52 | * CPU0 should not be shut down via hotplug. cpu_idle can WFI |
| 53 | * or a proper shutdown or hibernate should be used. |
| 54 | */ |
| 55 | return cpu == 0 ? -EPERM : 0; |
| 56 | } |